Come on now.... he would be just fine in the 90s, guaranteed not worse than today...

He's just learning to post.
He can't move without the ball at all.
His shot has improved, but with more resistance it will take a dip.
The lane will be far more clogged, thus eliminating many of his drives down the lane.
He'd also get fouled more without him getting the calls, which will eliminate some of the fts he gets and give the defense freedom to be more physical.

All of this adds up during the course of a game, the course of a season, the course of a career.